Apparatus for testing the operation of oxygen supply equipment for aircraft



3 Sheets-Sheet l R. R. OSBORNE ETAL APPARATUS FOR TESTING THE OPERATION OF OXYGEN SUPPLY EQUIPMENT FOR AIRCRAFT L Dec. 28, 1948.

Filed Aug. 9, 1945 Inventors Rambo "Rev OSBoRNE ERNEQT GRAHAn :DUNS'FORD Dec. 28, 1948. R. R. OSBORNE ET AL 2,457,713

' APPARATUS FOR TESTING THE OPERATION OF OXYGEN SUPPLY EQUIPMENT FOR AIRCRAFT Filed Aug. 9, 1945 3 Sheets-Sheet 2 v I b V n g I s Q N i- E j z////'2//:

Inventors RNAuo'Roy 0:30am: ERNEST GRAHAM Duus okn Attorne Dec. 28, 1948. R. R. OSBORNE ETAL Filed Au 9, 1945 APPARATUS FOR TESTING THE-OPERATION OF OXYGEN SUPPLY EQUIPMENT FOR AIRCRAFT 3 Sheets-Sheet 3 Fig.3

I nvenlors Romua Rev Os'Bo NE RNIEST ('rRnmm DVNSFORD v Attorneys Patented Dec. 28, 1948 APPARATUS'FOR TESTING-THE oPEnA rIQ F OXYGEN spPPLY EQUIPMENT FOR a jggglSg Manta-a 69m: GreatBn and Northem lrelahd, Lond'ong England; ann ta ion-essen ial 194a .ssriat tash:

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F 1, is a irhhtl le atihh the. ahehliaths with lid 2; open.

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e 3 s a situdi hl sh ihhi The ap arat s, t mhr ses a Q siha hatih lid to cover 2' at one end hingedthereto and'retained in the closed positionb aspring clip 3, a handle 4 being provldedior tijans pprt purposes. A bellows 5' is housed within the casing I provided with a supply pipe B, one,,end o t which projects into the rear of the casing and to which is attached by a bayonet 01h othen jointrl f the oxygen supply pipe (not shown) fromtheeeonomiser in the airoraft oxygensupply line." A; plate 8 pivoted on the outside of the end of the casing i may be provided for masking the end f the pipe 6 when the-apparatus is notin use.

The bellows 5 iSfOI mEd with a-rig id based-Agent over at the rear end and attached to the-easing by screws or bolts-qtq'and alsgsy ppqxgting the supply pipe 6 and at the front er d adapted to he screwed directly to the casing; If; A slottedifiggnt panel His also supported by the' rig id basej;

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v H sl hts ha h bell ws; Whshl deflate l st h. a traitterminedmannerand that 011'; inflation a pro gressive increaseof the interior volume in a i egv h Q F- I Q hZ hhhher mayh Qhthihed hi up mem eh tqat it iah arm t hith r t s ough h vsl txz i i he anel H, by h hBI 5 ma he d a ed ahd. ihthi h i this Position y a P JIQ QQ htlt Z5 Qhd l b t h e belt times. be i hd hwh rhm e aim 3: to hl QW the hllqws q QRQII, nder e F QQ E shhhes. hy 341$? .21 12 J' athr hasl it h 2 2311?! The arm 2 3 isalso formed with a pointer 29 pisojecti-ngthrough the slot 24 tofollow the openingt-ofthe hellows 5 and; operates in conjundtior with markings 30; on the panel toin dicate the maitimum and; minimum. permissiblesupply of More. than one oxygen-l from the economiser. pain oft maximav and minima markings" may be proy'i'ded tor economisers; having differing ratesl ottlottr:v A eursoralusliding; in a slot arm-the panel is: provided for, determiningthe, leakage" from the econemisen.

Amman:tmm theasupply pipe it communicates with a transparent tube; 34" arranged vertically other; non-return valve: 36 isprovided to allow oxygen to escape from the upper end of the tube 34 and prevent the entry of air when the bellows are opening.

In use the apparatus is connected by the supply pipe 6 to an oxygen economiser into which oxygen flows from a supply cylinder or bottle,

the apparatus taking the place of the airmans lungs and mask. As the bellows is closed and locked by bolt 25 (corresponding to expiration) the economiser bag fills with oxygen and the pressure within the bag rises until it is suficient to open a mica valve in the economiser (not shown) to allow a, small quantity of gas to escape into the bellows. The pressurewhich this builds up in the bellows closes the mica valve of the economiser and the gas in the bellows escapes through the valve 2! of the apparatus. .The cycle I is repeated rapidly and the oxygen therefore overflows from the economiser in a series of "small pulls, a portion of each puff being by-passed through the pipe 33 and tube 34, causing the ball 35 to rise up and down in the tube, thus indicating thatthe economiser is overflowing. Should the mica valve of the economiser be defective, a steady flow of oxygen through the bellows and out of the valve 2| will take place and the indi cator ball will remain stationary.

When the bolt 25 is released and the bellows open (corresponding to inspiration), a small suc- Cessation of flow from the economiser allowsthe mica valve to close and the pointer 23 will remain stationary at the end of its rapid rise and should come to rest between a pair of marks 30. If the economiser bag does not fill or empty completely, the pointer will not rise to the height of the lower mark of the pair. If air is drawn in through a hole or leaky joint, the pointer will rise above the upper mark.

The rise of the pointer 29 is also a measure of the contents of the economiser bag and if this bag is refilled and isolated from the supply for a short time (for example, 30 seconds), any leakage is shown by a lowerpointer reading when the bag contents are re-measured.

The cursor 3| is provided with two arms 3l'a, spaced apart a distance representing the leakage permissible from the economiser in 30 seconds;

Thus, if the economiser bag is filled and the upper arm 3la of the cursor is set at the level'to which the pointer 29 rises on release of the bolt 25 then, if the economiser bag is again filledand isolated from the source of supply for a period of 30 seconds, for example, before the bellows is again released, the pointer 29 should rise at least to the lower arm 3la, of the cursor,

indicating that the permissible leakage has not been exceeded. Of course, if the leakage exceeds the limits laid down and denoted by the two arms 3 la of the cursor 3|, then the pointer 29 will not rise to the level of the lower arm 3la.

We claim:

1. Apparatus for testing the operation of oxy= gen supply apparatus comprising a bellows adapted to be connected to the oxygen supply, a bolt for locking said bellows in the closed position,'and

spring means for opening said bellows on'release of said bolt, a pointer on the movable element of the bellows, a fixed datum in conjunction with which the pointer works to register the volume of oxygen supplied to the apparatus when said bellows is opened under the action of said spring means, on release of said bolt, and means to indicate that oxygen is flowing into the apparatus when said bellows is locked in the closed positiOIl;

2. Apparatus for testing the operation of oxygen supply apparatus comprising a bellows adapted to be connected to the oxygen supply apparatus, a bolt for locking said bellows in a closed position, spring means for opening said bellows on release of said bolt, stiffened sides and ends on the bellows to ensure that on deflation the bellows close in a prodetermined manner so that a progressive increase of the interior volume may be obtained on inflation, a pointer on the mov able element of the bellows, a fixed datum in conjunction with which the pointer works to register the volume of oxygen supplied to the apparatus when said bellows is opened under the action of said spring means, on release of said bolt, and means to indicate that oxygen is flowing into the apparatus when said bellows is locked in the closed position.

3. Apparatus for testing the operation of oxygen supply apparatus as in claim 2 in combination with a slotted panel mounted vertically on the stationery member of the bellows through the slot in which the pointer projects and calibrations on said panel adjacent the slot to indicate acceptable limits of pointer movement.

4. Apparatus for testing the operation of oxygen supply apparatus comprising a bellows connected tothe oxygen supply, a pointer on the movable element of the bellows, a slotted panel mounted vertically on the stationary member of the bellows through the slot in which the pointer projects, calibrations on said panel adjacent the slot to indicate acceptable limits of pointer movement, a tube on the panel connected to the oxygen supply, a ball in the tube to indicate that oxygen is flowing thereto and. non-return valves on the tube and on the bellows.

5. Portable apparatus for testing the operation of oxygen supply apparatus comprising a bellows connected to the oxygen supply, a pointer on the movable element of the bellows, a slotted panel mounted vertically on the stationary member of the bellows through the slot in which the pointer projects, calibrations on said panel adjacent the slot to indicate acceptable limits of pointer movement, a tube on the panel connected to the oxygen supply, a ball in the tube to indicate that oxygen is flowing thereto, non-return valves on the tube and on the bellows, and a casing within which the bellows are housed.

RONALD ROY OSBORNE. ERNEST GRAHAM DUNSFORD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 80,847 Wheeler Aug. 11, 1868 2,089,432 Ryan Aug. 10, 1937 2,345,387 Elsey Mar. 28, 1944 FOREIGN PATENTS Number Country Date 177,033 Great Britain Mar. 23, 1922 644,253 France June 4, 1928 

